{"id":70015,"date":"2025-07-20T12:00:00","date_gmt":"2025-07-20T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/nouveau-trou-dans-le-parc-national-de-yellowstone"},"modified":"2025-07-20T21:10:37","modified_gmt":"2025-07-20T21:10:37","slug":"nouveau-trou-dans-le-parc-national-de-yellowstone","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/nouveau-trou-dans-le-parc-national-de-yellowstone","title":{"rendered":"Nouveau Trou dans le Parc National de Yellowstone"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Le bassin forme presque un cercle parfait, l\u2019eau y est d\u2019un bleu azur et sa tempe\u0301rature s\u2019e\u0301le\u0300ve a\u0300 43\u00b0C. Mais cette e\u0301tendue d\u2019eau n\u2019est pas artificielle. Ce trou s\u2019est ouvert en seulement quelques semaines dans l\u2019un des plus ce\u0301le\u0300bres parcs du monde: le parc national de Yellowstone, situe\u0301 aux Etats-Unis.<\/p>\n<p>Le bassin a e\u0301te\u0301 de\u0301couvert par hasard en avril 2025 alors que des ge\u0301ologues menaient des ope\u0301rations de maintenance de routine sur des stations d\u2019enregistrement de la tempe\u0301rature au niveau du Norris Geyser Basin, \u00ab la zone thermale la plus chaude, la plus ancienne et la plus dynamique de Yellowstone \u00bb, selon le Service des parcs nationaux ame\u0301ricains. Lors de leur pre\u0301ce\u0301dente visite, a\u0300 l\u2019automne, le bassin n\u2019existait pas.<\/p>\n<p>Les donne\u0301es satellites ont permis d\u2019en savoir plus sur la date de formation du trou. Il n\u2019e\u0301tait pas pre\u0301sent le 19 de\u0301cembre 2024, mais de\u0300s le 6 janvier 2025, les images re\u0301ve\u0300lent la formation d\u2019une petite de\u0301pression dans la zone concerne\u0301e. Enfin, le 13 fe\u0301vrier, le trou semblait comple\u0300tement forme\u0301. Apre\u0300s avoir analyse\u0301 plusieurs donne\u0301es, les chercheurs pensent que la formation a de\u0301bute\u0301 le 25 de\u0301cembre.<\/p>\n<p><b>Plusieurs petites explosions<\/b><\/p>\n<p>L\u2019e\u0301tendue d\u2019eau mesure quatre me\u0300tres de diame\u0300tre. \u00ab Les ge\u0301ologues ont de\u0301couvert que le bassin e\u0301tait entoure\u0301e de nombreux petits rochers mesurant jusqu\u2019a\u0300 30 centime\u0300tres de diame\u0300tre, et que les rochers eux-me\u0302mes e\u0301taient recouverts de boue sableuse gris clair a\u0300 grains fins \u00bb, relate le 14 juillet 2025 le Yellowstone Volcano Observatory.<\/p>\n<p>Les diffe\u0301rentes observations re\u0301alise\u0301es sur le site ont permis de comprendre comment ce trou s\u2019est forme\u0301: il est le re\u0301sultat d\u2019explosions hydrothermales. Ce genre d\u2019explosion \u00ab peut se produire lorsque l\u2019eau chaude du syste\u0300me hydrothermal d\u2019un volcan se transforme en vapeur, brisant les roches et les projetant dans les airs \u00bb, selon le Service ge\u0301ologique des E\u0301tats-Unis.<\/p>\n<p>Une station de surveillance, qui utilise les infrasons afin de mesurer l\u2019activite\u0301 hydrothermale, a releve\u0301 \u00ab plusieurs signaux acoustiques de faible intensite\u0301 provenant de la direction \u00bb du trou nouvellement forme\u0301. Il ne serait donc pas le re\u0301sultat d\u2019une seule explosion majeure. \u00ab Il semble pluto\u0302t que la formation se soit produite a\u0300 la suite de multiples petits e\u0301ve\u0301nements qui ont d\u2019abord projete\u0301 des roches, puis de la boue siliceuse sur une courte distance, cre\u0301ant une petite fosse qui s\u2019est remplie d\u2019eau riche en silice \u00bb, pensent les scientifiques.<\/p>\n<p><b>Un panache d\u2019eau et de fragments de roche a\u0300 une hauteur estime\u0301e de 120 a\u0300 180 me\u0300tres !<\/b><\/p>\n<p>Les explosions hydrothermales sont des e\u0301ve\u0301nements relativement courant dans le Norris Geyser Basin. Certains de ces e\u0301ve\u0301nements sont, a\u0300 l\u2019inverse de celui-ci, brefs et pluto\u0302t violents. Ainsi, le 23 juillet 2024, une explosion hydrothermale a conduit a\u0300 la projection d\u2019un panache d\u2019eau et de fragments de roche a\u0300 une hauteur estime\u0301e de 120 a\u0300 180 me\u0300tres !<\/p>\n<p>En moyenne, plusieurs explosions hydrothermales de diffe\u0301rentes ampleurs ont lieu chaque anne\u0301e quelque part dans le parc national de Yellowstone. Elles passent souvent inaperc\u0327ues.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Le bassin forme presque un cercle parfait, l\u2019eau y est d\u2019un bleu azur et sa tempe\u0301rature s\u2019e\u0301le\u0300ve a\u0300 43\u00b0C. Mais cette e\u0301tendue d\u2019eau n\u2019est pas artificielle. Ce trou s\u2019est ouvert en seulement quelques semaines dans l\u2019un des plus ce\u0301le\u0300bres parcs du monde: le parc national de Yellowstone, situe\u0301 aux Etats-Unis. Le bassin [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":70014,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Nouveau Trou dans le Parc National de Yellowstone - Senegal<\/title>\n<meta name=\"description\" content=\"Le bassin forme presque un cercle parfait, l\u2019eau y est d\u2019un bleu azur et sa tempe\u0301rature s\u2019e\u0301le\u0300ve a\u0300 43\u00b0C. 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